| /* Conversion module for Unicode |
| Copyright (C) 1999-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <byteswap.h> |
| #include <dlfcn.h> |
| #include <gconv.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| /* This is the Byte Order Mark character (BOM). */ |
| #define BOM 0xfeff |
| /* And in the other endian format. */ |
| #define BOM_OE 0xfffe |
| |
| |
| /* Definitions used in the body of the `gconv' function. */ |
| #define FROM_LOOP from_unicode_loop |
| #define TO_LOOP to_unicode_loop |
| #define DEFINE_INIT 0 |
| #define DEFINE_FINI 0 |
| #define MIN_NEEDED_FROM 2 |
| #define MIN_NEEDED_TO 4 |
| #define FROM_DIRECTION (dir == from_unicode) |
| #define PREPARE_LOOP \ |
| enum direction dir = ((struct unicode_data *) step->__data)->dir; \ |
| int swap; \ |
| if (FROM_DIRECTION) \ |
| { \ |
| if (data->__invocation_counter == 0) \ |
| { \ |
| /* We have to find out which byte order the file is encoded in. */ \ |
| if (inptr + 2 > inend) \ |
| return (inptr == inend \ |
| ? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \ |
| \ |
| if (get16u (inptr) == BOM) \ |
| /* Simply ignore the BOM character. */ \ |
| *inptrp = inptr += 2; \ |
| else if (get16u (inptr) == BOM_OE) \ |
| { \ |
| data->__flags |= __GCONV_SWAP; \ |
| *inptrp = inptr += 2; \ |
| } \ |
| } \ |
| } \ |
| else if (!data->__internal_use && data->__invocation_counter == 0) \ |
| { \ |
| /* Emit the Byte Order Mark. */ \ |
| if (__builtin_expect (outbuf + 2 > outend, 0)) \ |
| return __GCONV_FULL_OUTPUT; \ |
| \ |
| put16u (outbuf, BOM); \ |
| outbuf += 2; \ |
| } \ |
| swap = data->__flags & __GCONV_SWAP; |
| #define EXTRA_LOOP_ARGS , swap |
| |
| |
| /* Direction of the transformation. */ |
| enum direction |
| { |
| illegal_dir, |
| to_unicode, |
| from_unicode |
| }; |
| |
| struct unicode_data |
| { |
| enum direction dir; |
| }; |
| |
| |
| extern int gconv_init (struct __gconv_step *step); |
| int |
| gconv_init (struct __gconv_step *step) |
| { |
| /* Determine which direction. */ |
| struct unicode_data *new_data; |
| enum direction dir = illegal_dir; |
| int result; |
| |
| if (strcmp (step->__from_name, "UNICODE//") == 0) |
| dir = from_unicode; |
| else |
| dir = to_unicode; |
| |
| new_data = (struct unicode_data *) malloc (sizeof (struct unicode_data)); |
| |
| result = __GCONV_NOMEM; |
| if (new_data != NULL) |
| { |
| new_data->dir = dir; |
| step->__data = new_data; |
| |
| if (dir == from_unicode) |
| { |
| step->__min_needed_from = MIN_NEEDED_FROM; |
| step->__max_needed_from = MIN_NEEDED_FROM; |
| step->__min_needed_to = MIN_NEEDED_TO; |
| step->__max_needed_to = MIN_NEEDED_TO; |
| } |
| else |
| { |
| step->__min_needed_from = MIN_NEEDED_TO; |
| step->__max_needed_from = MIN_NEEDED_TO; |
| step->__min_needed_to = MIN_NEEDED_FROM; |
| step->__max_needed_to = MIN_NEEDED_FROM; |
| } |
| |
| step->__stateful = 0; |
| |
| result = __GCONV_OK; |
| } |
| |
| return result; |
| } |
| |
| |
| extern void gconv_end (struct __gconv_step *data); |
| void |
| gconv_end (struct __gconv_step *data) |
| { |
| free (data->__data); |
| } |
| |
| |
| /* Convert from the internal (UCS4-like) format to UCS2. */ |
| #define MIN_NEEDED_INPUT MIN_NEEDED_TO |
| #define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM |
| #define LOOPFCT TO_LOOP |
| #define BODY \ |
| { \ |
| uint32_t c = get32 (inptr); \ |
| \ |
| if (__builtin_expect (c >= 0x10000, 0)) \ |
| { \ |
| UNICODE_TAG_HANDLER (c, 4); \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| else if (__builtin_expect (c >= 0xd800 && c < 0xe000, 0)) \ |
| { \ |
| /* Surrogate characters in UCS-4 input are not valid. \ |
| We must catch this, because the UCS-2 output might be \ |
| interpreted as UTF-16 by other programs. If we let \ |
| surrogates pass through, attackers could make a security \ |
| hole exploit by synthesizing any desired plane 1-16 \ |
| character. */ \ |
| result = __GCONV_ILLEGAL_INPUT; \ |
| if (! ignore_errors_p ()) \ |
| break; \ |
| inptr += 4; \ |
| ++*irreversible; \ |
| continue; \ |
| } \ |
| else \ |
| { \ |
| put16 (outptr, c); \ |
| outptr += 2; \ |
| } \ |
| \ |
| inptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #define EXTRA_LOOP_DECLS \ |
| , int swap |
| #include <iconv/loop.c> |
| |
| |
| /* Convert from UCS2 to the internal (UCS4-like) format. */ |
| #define MIN_NEEDED_INPUT MIN_NEEDED_FROM |
| #define MIN_NEEDED_OUTPUT MIN_NEEDED_TO |
| #define LOOPFCT FROM_LOOP |
| #define BODY \ |
| { \ |
| uint16_t u1 = get16 (inptr); \ |
| \ |
| if (swap) \ |
| u1 = bswap_16 (u1); \ |
| \ |
| if (__builtin_expect (u1 >= 0xd800 && u1 < 0xe000, 0)) \ |
| { \ |
| /* Surrogate characters in UCS-2 input are not valid. Reject \ |
| them. (Catching this here is not security relevant.) */ \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (2); \ |
| } \ |
| \ |
| put32 (outptr, u1); \ |
| \ |
| inptr += 2; \ |
| outptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #define EXTRA_LOOP_DECLS \ |
| , int swap |
| #include <iconv/loop.c> |
| |
| |
| /* Now define the toplevel functions. */ |
| #include <iconv/skeleton.c> |
